The Actors
Rob Pattinson: InFP
I thought he was ISFP for a while. After keeping tabs on him though, the guy's a little too much like me, except... y'know male. He is very well-read (into Charles Baudelaire), writes songs, sings the "blues" (or at least a bauched British version of what "blues" is), and the way he went about playing the character of Edward is very INFP.
Kristen Stewart: IStP
Emphasis on the I and P. Yeah, the girl's deep, but it doesn't mean she has to be an N to be that. She's more smooth in her movements than Robert is. Where he stumbles and trips over things she does just fine. She has a cool factor that most ISTPs I know have

.
ISTP ef tee dub u.
Taylor Lautner: ESTP
He was in extreme martial arts for ages. He works out like a maniac. Perfect teen heartthrob, essentially.
Ashley Greene: ISFJ
In interviews she's nice and sweet and doesn't want to hurt anyone's feelings. Marketable ISFJ.
Jackson Rathbone: ISFP
I really just wanted to type him as "ridiculous hipster," but I'm feeling nice

.
Nikki Reed: ESFP
You should hear this girl's life story.
:crazy:.
Kellan Lutz: ESFJ
A lot like Emmett, except I think he's much less impulsive. He's exactly the type your mom deems a "very nice boy." Like many of the male ESFJs I know.
..Don't care enough about the rest.
Characters
Edward: InFJ
I was intially thinking maybe INFP, but the INFJs I know definitely have self-control over me any day. I chose NF over SJ because he attempted suicide in the name of love. Very NF. I also thought about IntJ and IStP for Edward but reeeeally don't think so.
Bella: ISFP/ISFJ
It doesn't really matter which. Both fit whenever Meyer wants to make the next book more compelling and "sellable" than the one before it. For clarification, I have read all the books and watched the first movie (unfortunately), and Bella is certainly
not an INFP. I was just
waiting for someone to mistype yet another ISFP/ISFJ as INFP. Happens so often....
Jacob: eSTP
I wanted to say Jacob was introverted, but he was always wooting and hollering. I know very many ESTPs and ISTPs, and the "wooting and hollering" definitely goes to the ESTP. Makes the E/I distinction that much easier. Figuring out the STP part was easy. He's into cars and mechanics (Like, duh). Plus, he's prone to say something along the lines of, "I'm ready to have a goood time, guys! Let's do it! *pumps fist in the air*" Too STP!
Charlie: ISfJ
I keep picturing John C. Reilly as Charlie. There's just something about him. The only reason I can think of is because Reilly has a slightly goofy awkwardness about him that worked well with the characterization of Charlie. Definitely F but kind of serious, too.
Alice: ENFJ/ENFP with great use of Ni
Everyone loves her. Seriously. I haven't met a single person who's read the series and isn't enamored with her. Personally not a big fan. She's certainly cute and fun and zany and exciting, but
too happy sometimes for my taste.
Emmett: ESfP
Adorable. Cuddly. Bunch of Fun. I was hesitant to put the F there but realized I was just projecting my own "F=female and T=male" prejudice onto it (Yes, I'm ashamed). He's too
bright and shiny to be T... although he still could be.
Carlisle: eNFJ
One of my favorite characters in the entire series. Gotta love a mature ENFJ.
Esme: INFP
She was also one of my favorite characters. Meyer hardly gave her any "stage time" in the books, but there was something about her that I loved. She was definitely Carlisle's cheerleader. The perfect INFP/ENFJ pairing when you think about it.
Jasper: Creep! ...I mean, ISTP/InfP/ISTJ/ISFP
I really don't know. It'd be cool if he and Alice could be an ENFP/ISTJ, "opposites attract" pair (and they very well may be), but I get P from him. And on top of that, his vampire power is to sense other people's emotions. That's so INFP it hurts. Or at least something from a F user. On the other hand though, I still think he's a T, hence the ISTP and ISTJ typing.
...Wait, scratch that. He
changes people's moods as well. That screams "Fe, Fe, FE!!!". InFJ or ISFJ seems like a good assessment. Yeah, I think I'll say IxFJ.
Rosalie: ISTJ
Cold as ice. Reminds me of Angela from The Office.
ISTJ strong on the TJ.
Sidenote: By contributing to this thread, I have sold my soul.